Fix circular import of scapy in dhcp (#56040)

* Fix circular import of scapy in dhcp

* Tweak import, add comment

* Tweak import, add comment

* pylint

homeassistant/components/dhcp/__init__.py

@@ -279,6 +279,17 @@ class DHCPWatcher(WatcherBase):
         """Start watching for dhcp packets."""
         # Local import because importing from scapy has side effects such as opening
         # sockets
+        from scapy import (  # pylint: disable=import-outside-toplevel,unused-import  # noqa: F401
+            arch,
+        )
+
+        #
+        # Importing scapy.sendrecv will cause a scapy resync which will
+        # import scapy.arch.read_routes which will import scapy.sendrecv
+        #
+        # We avoid this circular import by importing arch above to ensure
+        # the module is loaded and avoid the problem
+        #
         from scapy.sendrecv import (  # pylint: disable=import-outside-toplevel
             AsyncSniffer,
         )